Fix table position characteristic reading wrong table position

[seanngpack]

Describe the bug I'm writing ints to tablePosition characteristics where the method signature says it requires the type to be a byte. This causes Python to read incorrectly table values when the data is > 255.

To Reproduce Run Arduino.py and get the table position to be over 255.

Proposal Go to main.cpp, line 183, and convert currentPosition to bytes